screen blacks out after pressing a key on keyboard, specially enter key

I have natty and have installed kubuntu-desktop package. Before installing it, everything was fine but after that, this thing happens:

When I'm typing, after stroking a key, screen blacks out, fan speeds up, and I have to turn off machine by pressing power button.

It just happens in many different apps (chromium, hotot, kde proxy settings, ...) and in every environment: Unity, KDE, Gnome 2.

I don't know what details must provide with this question, and I don't like to remove my KDE desktop, or re-install Ubuntu.

Solution 1:

This seems to be a bug. Report it here

Maybe it is because your system isn't powerful enough.

It would be nice if you could post the output of uname -a and your system specifications.

Edit: Maybe the Enter key is set to do something else when it's pressed. See if you can go into System Settings and change that.

Edit: To rebind the Enter key, make a new file called .xmodmaprc That file should go into your Home directly (~). In the file, type pointer = default

Edit: You might also try this: System ➜ Preferences ➜ Keyboard Shortcuts

and see if anything's bound to "Enter"